LR4 CAMPBELL | Alldatasheet

Document overview

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Technical content

Features

The LR4 Four-Channel Latching Relay Module is ideal for locations where power is unreliable or needs to be conserved. Unlike traditional relays that must be continuously powered to keep their state, the LR4 mechanically latches the relay’s state allowing power to be removed. The only way to

  • Low power consumption
  • Relay state is non- volatile
  • 4 channels
  • LED indicators
  • Manual toggle override for each relay
  • Compatible with all SDI-12 capable dataloggers LR4 Four-Channel Latching Relay Module Relay Details Contacts Relay #1 and Relay #2 2 independent; single pole single throw (SPST) Relay #3 and Relay #4 2 independent; single pole double throw (SPDT) Maximum Voltage Ratings: 30V DC/30V AC Maximum Current: Relay #1 and Relay #2 Not to exceed 100V A or 5 A Relay #3 and Relay #4 Not to exceed 60V A or 2 A change the state of a relay is to send a command to the LR4 or to press the manual toggle button. The datalogger sends commands to the LR4 via the SDI-12 protocol or ModBus protocol.

We reserve the right to alter specifications without notice Campbell Scientific products are available from: Maximum Number of SensorsSpecifications Supply Voltage: 9-30VDC Power Consumption: Quiescent: < 2.0 mA Peak: < 250 mA Operating Temperature: -40ºC to +60ºC Relay Type: Latching Communications Hardware: SDI-12, RS232 or RS485 Protocol: SDI-12 Version 1.3 or MODBUS via RS232/485 at 19,200 bps Digital I/O Input Voltage Maximum: +20 Vdc Minimum: -12 Vdc Operating Temperature: -40ºC to +60ºC Dimensions Length: 17.0 cm (6.7 in) Height: 6.1 cm (2.4 in) Width: 3.7 cm (1.5 in) Weight: 0.48 kg (1.05 lb)

Ordering Information

LR4 Four Channel Latching Relay Module Relay-to-Datalogger Cables A Standard 3 m cable is included. CABLE3CBL Three-conductor, 22 AWG cable with drain wire and Santoprene jacket used for SDI-12 communications. CABLE4CBL Four-conductor, 22 AWG cable with drain wire and Santoprene jacket used for SDI-12 and digital I/O port communications. CABLE2TP Two-twisted-pair, 22 AWG cable with drain wire and Santoprene jacket used for ModBus communications.